PS3 sales aren't bad, it's just that 360 sales are much higher than they've been so far. PS3 will probably experience a similar, although not necessarily an exactly similar, boost when its price drops like $50/50€.
Also, Gran Turismo 5 ought to be a huge help. The so-called demo has sold more than most PS3 games, I believe the series is still very strong even if it isn't as strong as it used to be. It's definitely the biggest Playstation exclusive series right now. Well, ever, not just now.
Anyway, to increase sales, increase value. Either much stuff with PS3, better software (like Gran Turismo), or cut the price. They all increase value, in reverse order to what I said. Depending on Sony's strategy, they could cut price this year but I doubt it since they probably want to maximize profits after a long time. Next year, however, it's bound to happen. Software is fine, they have constantly a great lineup of games coming. GT5 is the biggest though, after that I'm not so sure there are any system-sellers. And more stuff, well, I suppose Move could go into that category, sort of. Sony is sure to release some great bundles as well. A GT5 bundle would move tons of consoles.
